In-Situ Stress and Fault Reactivation in Bozhong 34-2 Oilfield of Huanghekou Sag, Bohai Bay Basin

This study have applied Fault Analysis Seal Technology to the Bozhong 34-2 oilfield, located the relative risk areas of faults, and try to guide water injection in the process of oilfield development. The “Huang model” is used to obtain the in-situ stress. The stress magnitudes indicate a normal faulting regime in the study area, and the direction of maximum horizontal principal stress is N70°E. The fault stability is controlled by fault orientation obviously, and the faults with strike near east-west, dip angle close to 60° have a relatively high risk. All faults are stable under the hydrostatic condition, but the processes of injection and production have a strong influence on the pressure. Therefore, for accurate determination of fault risk, it is necessary to simulate the current pore pressure distribution.